Hello Smilo,
Following on from your comments on the P47d sounds to be used
with a modified (or not...) Merlin Sound.cfg file by Minuteman10:

I had already put the Merlin Sound.cfg in with the P47d sounds.
so, I just moved the whole sound file over into the Ju-52 one.

The sounds themselves are nicely noisy and clanky, and the
only thing to be corrected would be to make .wav sound 4 higher
in pitch, because the revs sound a bit too slow - low in pitch.

However, from your comment on the other thread, I suppose it
canīt be done in the Sound.cfg only, because it would entail the
engine itself having to raise its RPM to increase sound pitch.

So, I suppose, itīs no good.

Thatīs probably why the Extra300 sound sounds quite good with
the Ju-52īs low RPMīs - because itīs really a very high pitched
sound on a high-rev engine.
Hmmmm... No pun intended...
Cheers,
Aleatorylamp